Earlier quoted context omitted.
That whole thing is temporary until 2021 when other companies will get a chance to use 5nm fabs.
Don't count on it. Apple's mobile chips have been consistently the best in the business. When the A14 was released, the second fastest mobile chip you can buy became... the A13. Is this unsurmountable? Obviously not, it's excellent engineering, not a pact with the Devil. But you can't just hand-wave it away either, Apple's silicon is the one to beat, and they have a head start.
Even if the rest of the PC industry never goes to ARM, Apple’s market share won’t change more than one measly percent IMO.